$36d^2-24d+16$
$x+12\le3x$
$30x^2+x-1$
$\frac{\left(x^3+8x^2-7\right)}{x\cdot8}$
$\frac{d^2}{dx^2}\sin\left(x\right)+\tan\left(x\right)$
$2x^2\:-4$
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